Lythuyet- Bai Tap 3d Foundation

CHNG TRNH TNH TOAN NEN MONG CONG TRNH NGAM PLAXIS 3D FOUNDATION

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PHAN T DAM ( BEAM )




FLOORS




WALLS




PILES




SPRINGS




TAI TRONG




LINE LOADS

POINT LOADS




CALCULATION




NEXT PHASE

PHASE WINDOWS

PREVIEW

SELECT POINTS FOR CURVES

CALCULATE / OUTPUT




CAC QUI C VE NOI LC

DAM




SAN




WALL




THC HANH Bai 1. 3D FOUNDATION - Mong vuong 3 x 3 m day 1.5 m , bang BTCT co E = 25000000 kN/m2 chu tai P = 1000kN

Bc 1: Khai bao bai toan , vung Xmin = -5 ; Xmax = 5 Zmin = -5 : Zmax = 5




Bc 2: Khai bao cac mat phang lam viec

Dung bieu tng Work Plane nhap y = 0 ; y = -9 va y = -15

Bc 3 : Vao tng mat phang Y = 0 ve mong ( line )




Y = 0 ve san Y = 0 ve lc tap trung Y = 0 Dung line ve mong Y = 0 Ve san bang bieu tng va ve cac lc tap trung

Bc 4 : Vao bieu tng lo khoan va chon v tr , nhap Y = 0 ; Y = -9 va Y = -15 Khai bao mc nc ngam Y = -15 va lp at t 0 en 15 m




OK

Bc 5 : Khai bao cac ac trng cua at nen




Sau khi khai bao ac trng at nen gan at nen vao lo khoan




Cot at bay gi se mau xanh Bc 6: Chon mat phang tai Y = 0 khai bao vat lieu lam san mong va gan vat lieu cho mong.

Bc 8 : Phat sinh li 2D Mesh Generation




Neu khu vc san can chia li mn hn th co the chon khu vc san va dung lenh Refine cluster.


Bc 10 : Tnh toan




Phase ban au :

Vi phase ban au cha co cong trnh g het tc la tai : Mat phang Y = 0 th

Mat phang Y = -9 th




Va mat phang Y = -15 m th

Ket qua phase ban au la:




Tnh toan cho phase 1 : Co mong Next phase Phase 1 : Co mong , nh vay tai Y = 0 chon hien th san mong.




Ket qua phase 1 nh sau :

Phase 2 : Bat au t Phase 1 va gan them tai trong tap trung Y = -1000 KN mat phang Y = 0 m

Ket qua nh sau:




Chon Total Displacement

Chon

Ke mot ng ngang qua gia mong ta co:




Chon mat phang Y = 0 , nhap vao phan t san ta xem noi lc cua san , v du vao Forces , xem Momen M11

M11




Va M22

M22

Va M12

M12




Bai 2-1. 3D FOUNDATION - Mong coc 3 x 3 m day 1.5 m , gom 4 coc 25 x 25 cm dai 9 m bo tr cach tam 1m , bang BTCT co E = 25000000 kN/m2 chu tai P = 1000kN






Dung bieu tng Work Plane nhap y = 0 ; y = -4.5, y = -9 va y = -15




Bc 3 : Vao tng mat phang Y = 0 ve mong ( line ) Y = 0 ve coc Y = 0 ve san Y = 0 ve lc tap trung Y = 0 Dung line ve mong Y = 0 Dung bieu tng coc ve coc va gan vat lieu coc




Y = 0 Ve san bang bieu tng va ve cac lc tap trung




Bc 4 : Vao bieu tng lo khoan va chon v tr , nhap Y = 0 ; Y = -4.5 Y = -9 va Y = -15 ch v tr cac lp at. Khai bao mc nc ngam Y = -15 va lp at t 0 en 15 m

OK

Bc 5 : Khai bao cac ac trng cua at nen 2 lp , lp tren yeu , lp di tot.




Lp di : Sand




Cot at bay gi se mau xanh va mau vang. Bc 6: Chon mat phang tai Y = 0 khai bao vat lieu lam san mong va gan vat lieu cho mong( Floor ).




Neu khu vc san can chia li mn hn th co the chon khu vc san va dung lenh Refine cluster. Bc 9 : Phat sinh li 3D Mesh Generation

Bc 10 : Tnh toan Phase ban au :





Mat phang Y = -4.5 va -9 th





Tnh toan cho phase 1 : Co mong coc Next phase Phase 1 : Co mong coc , nh vay tai Y = 0 chon hien th san mong.

Tai Y = -4.5 va Y = -9 co coc






Ket qua nh sau:





Chon




Ke mot ng ngang qua gia coc ta co:





M11




M22

M22

Va M12

M12




Bai 2-2. 3D FOUNDATION - Mong coc 3 x 3 m day 1.5 m , gom 4 coc 25 x 25 cm dai 9 m bo tr cach tam 1m , bang BTCT co E = 25000000 kN/m2 chu tai P = 1000kN ( Khong dung phan t Floor)






Dung bieu tng Work Plane nhap y = 1.5 ; y = 0 ; y = -4.5, y = -9 va y = -15




Bc 3 : Vao tng mat phang Y = 1.5 ve mong ( line ) Y = 1.5 ve coc Y = 1.5 ve lc tap trung Y = 1.5 Dung line ve mong Y = 1.5 Dung bieu tng coc ve coc va gan vat lieu coc




Y = 1.5 Ve lc tap trung




Bc 4 : Vao bieu tng lo khoan va chon v tr , nhap Y = 1.5 ;Y = 0 ; Y = -4.5 Y = -9 va Y = -15 ch v tr cac lp at. Khai bao mc nc ngam Y = -15 va lp at t 0 en 15 m

OK

Bc 5 : Khai bao cac ac trng cua at nen 2 lp , lp tren yeu , lp di tot.




Lp di : Sand




Cot at bay gi se mau xanh va mau vang Bc 6: Chon mat phang tai Y = 1.5 khai bao vat lieu lam mong va gan vat lieu cho mong( ai ).






Vi phase ban au cha co cong trnh g het tc la tai : Mat phang Y = 1.5 th




Y = 0






Tnh toan cho phase 1 : Co mong coc Next phase Phase 1 : Co mong coc , nh vay tai Y = 1.5 chon hien th ai mong.

Tai Y = 0




Phase 2 : Bat au t Phase 1 va gan them tai trong tap trung Y = -1000 KN mat phang Y = 1.5 m

Ket qua nh sau:


Chon




Bai 3. 3D FOUNDATION - Mong bang giao nhau 8 m va 6m , bang BTCT co E = 25000000 kN/m2 chu tai P = 500kN






Dung bieu tng Work Plane nhap Y = 0 va Y = -20

Bc 3 : Vao tng mat phang Y = 0 ve mong bang ( line )




Y = 0 Ve cac lc tap trung

Bc 4 : Vao bieu tng lo khoan va chon v tr , nhap Y = 0 va Y = -20 Khai bao mc nc ngam Y = -20 va lp at t 0 en 20 m




OK





Cot at bay gi se mau vang Bc 6: Chon mat phang tai Y = 0 khai bao vat lieu lam mong (beam) b = 0.8 m , h = 1 m , A = 0.8 m2 tnh I2 va I3 va gan vat lieu cho mong.




Mat phang Y = -20 th





Tnh toan cho phase 1 : Co mong Next phase Phase 1 : Co mong , nh vay tai Y = 0 chon hien th mong.





Ket qua nh sau:





Chon mat phang Y = 0 , nhap vao phan t dam ta xem noi lc cua dam , v du vao Forces , xem Momen M11




M11 M22

M22

Va Q23

Q23

Chuyen v




Bai 4. 3D FOUNDATION - Mong tron D = 2 m day 0.143 m , bang BTCT co E = 34000000 kN/m2 , muy = 0 chu tai q = 375kN/m2






Dung bieu tng Work Plane nhap y = 0 ; y = -4




Bc 3 : Vao tng mat phang Y = 0 ve mong ( pile ) e tao hnh tron. Y = 0 ve san Y = 0 ve lc phan bo Y = 0 Dung Pile ve mong

OK

Y = 0 Ve san bang bieu tng va ve cac lc phan bo len mong




Bc 4 : Vao bieu tng lo khoan va chon v tr , nhap Y = 0 va Y = -4 Khai bao mc nc ngam Y = -4 va lp at t 0 en 4 m




OK





Cot at bay gi se mau xanh Bc 6: Chon mat phang tai Y = 0 khai bao vat lieu lam san mong va gan vat lieu cho mong.





Mat phang Y = -4 th





Tnh toan cho phase 1 : Co mong va co tai trong q = 375 kN/m2 Next phase Phase 1 : Co mong , nh vay tai Y = 0 chon hien th san mong va lc phan bo.




M11

M22

M22

Va M12

M12




Bai 5 3D FOUNDATION Mong tam giac

Bai 6 3D FOUNDATION Mong bat ky

Bai 7.1 3D FOUNDATION - Mong coc ai cao 3 x 3 m day 1.5 m , gom 4 coc 25 x 25 cm dai 9 m bo tr cach tam 1m , bang BTCT co E = 25000000 kN/m2 chu tai P = 1000kN, mat at cao o -4.5m ai cao o = 0m





Dung bieu tng Work Plane nhap y = 0 ; y = -1.5 , y = -4.5, y = -9 va y = -15




Bc 3 : Vao tng mat phang Y = 0 ve mong ( line ) Y = 0 ve coc Y = 0 ve lc tap trung Y = 0 Dung line ve mong Y = 0 Dung bieu tng coc ve coc va gan vat lieu coc

Y = 0 Ve lc tap trung




Bc 4 : Vao bieu tng lo khoan va chon v tr , nhap Y = 0 ; Y = -4.5 Y = -9 va Y = -15 e ch v tr cac lp at. Khai bao mc nc ngam Y = -15 va lp at t 0 en 15 m




OK

Bc 5 : Khai bao cac ac trng cua at nen 2 lp , lp tren yeu( hoac nh lp di ) v lp nay khong tnh v ai cao , lp di tot.




Lp di : Sand co cao o t -4.5m




Cot at bay gi se mau xanh di va vang tren Bc 6: Chon mat phang tai Y = 0 khai bao vat lieu lam san mong va gan vat lieu cho mong( ai bang be tong ).






Vi phase ban au cha co cong trnh g het tc la tai : Mat phang Y = 0 va Y = -1.5 th




Tnh toan cho phase 1 : Co mong coc Next phase Phase 1 : Co mong coc , nh vay tai Y = 0 chon hien th vat lieu ai mong.




Tai Y = -1.5 ta co





Dung bieu tng PREVIEW ta c





Phase 2 : Bat au t Phase 1 va gan them tai trong tap trung Y = -1000 KN mat phang Y = 0 m Ket qua nh sau:




Chon Total Displacement va tai mat phang Y = -4.5

Chon





Phase 3 : Bat au t Phase 1 va gan tai trong X = 50 kN va Y = -1000 kN Ket qua nh sau:




Bai 7.2 Giong nh bai 8 nhng ai be tong c thay bang Floor co chieu day 1.5 m. ai cao o -1.5 m va mat at cao o -4.5m.




Tnh toan cho cac phase: Phase 0 : Ban au Phase 1 : Co Floor ( san ) va coc Phase 2 : Co tai Y = -1000 kN Phase 3 : Bat au t phase 1 , co tai X = 50 kN va Y = -1000 kN Ket qua cac phase nh sau : Phase 0 : Ban au




Phase 1 : Co ai ( Floor ) va coc




Phase 2 : Co tai trong Y = -1000 kN




Phase 3 : Bat au t Phase 1 , tai trong X = 50 kN va Y = -1000 kN




Bai 8. 3D FOUNDATION - Mong be co tng tang ham





Dung bieu tng Work Plane nhap y = 0 ; y = -2 va y = -28

Bc 3 : Vao tng mat phang y = 0 ve tng Y = -2 ve san




Y = -2 ve cac lc tap trung Y = 0 Ve tng bang bieu tng

Y = -2 Ve san bang bieu tng va ve cac lc tap trung




Bc 4 : Vao bieu tng lo khoan va chon v tr v du X = -40 ; Y = -20 Khai bao mc nc ngam Y = -2 va lp at t 0 en 28 m

OK






Cot at bay gi se mau xanh Bc 6: Chon mat phang tai Y = 0 khai bao vat lieu lam tng va gan vat lieu cho tng.




Bc 7 : Chon mat phang Y = -2 khai bao vat lieu san va gan vat lieu cho san tang ham.





Neu khu vc san can chia li mn hn th co the chon khu vc san va dung lenh Refine cluster. Bc 9 : Phat sinh li 3D Mesh Generation

Bc 10 : Tnh toan




Phase ban au :


Mat phang Y = -2 th




Tnh toan cho phase 1 : Co tng va san tang ham Next phase Phase 1 : Co tng va san tang ham, nh vay tai Y = 0 chon hien th tng.




Tai Y = -2 cho hien th san tang ham




Tai Y = -28 m th





Phase 2 : Bat au t Phase 1 va gan them tai trong tap trung Y = -6000 KN mat phang Y = -2 m

Ket qua nh sau:


Chon




Ke mot ng ngang qua gia ta co:




Bai 9. 3D FOUNDATION - Sc chu tai cua coc






Dung bieu tng Work Plane nhap y = 20.6 ; y = 20 , y = 19.4 , y = 10 va y = 0

Bc 3 : Vao tng mat phang Y = 20.6 ve coc Dung bieu tng ve coc , chon Massive circular pile




Khai bao vat lieu coc va gan cho coc tai v tr (0,0) cac mat phang Y = 20.6 , Y = 20 va 19.4




Tao lo trong xung quanh coc ( v trong qua trnh th coc can tao lo trong e chat tai )

Dung bieu tng Zoom zoom khu vc (-2,-2) va (2,2)

Dung bieu tng Line ve khu vc tao lo (-1,-1) - (-1,1) - (1,1) (1,-1) (-1,-1). Tao tai trong Chon mat phang lam viec Y = 20

Dung ve ng (0,0) en (-1,0) Dung bieu tng tai tap trung ve tai tap trung




Bc 4 : Vao bieu tng lo khoan va chon v tr v du X = -5 ; Y = 0 Khai bao mc nc ngam Y = 9.6 va nhap v tr cac lp at t 20.6 en 0 m

OK




Thay oi mau cho vat lieu bang cach nhap vao o ch nhat cuoi

ben trai trong ac trng vat lieu.






Cot at bay gi se co cac mau ac trng cac lp at.





Mat phang Y = 20, 19.4 , 10 th




Va mat phang Y = 0 m th





Tnh toan cho phase 1 : ao lo va co coc Next phase Phase 1 : Co lo va co coc ,nh vay tai Y = 20.6 th




Tai Y = 20 th




Tai Y = 19.4 th




Tai Y = 10 th




Tai Y = 0 th




Phase 2 : Bat au t Phase 1 va gan them tai trong tap trung Y = -800 KN mat phang Y = 20 m Lu y : Parameters ay khong chon Default ma phai chon




Ket qua nh sau:


Chon




Ke mot ng ngang qua gia ta co:




Bai 10. 3D FOUNDATION - Coc ng knh ln chu lc neo

Coc

Coc co chieu dai 6 m , ng knh D = 2m, chu lc neo vi 3 trng hp : Goc 0 o : Fx = 1000 kN Goc 30 o : Fx = -866 kN va Fy = 500 kN Goc 60 o : Fx = -500 kN va Fy = 866 kN Bc 1: Khai bao bai toan , vung Xmin = 0 ; Xmax = 40 Zmin = 0 : Zmax = 40





Dung bieu tng Work Plane nhap y = 0 ; y = -1.5 va y = -6

Bc 3 : Vao tng mat phang Y = 0 ve coc




Dung bieu tng ve coc , chon Circular tube

Khai bao vat lieu coc va gan cho coc tai v tr (0,0) cac mat phang Y = 0 , Y = -1.5




Tao tai trong Chon mat phang lam viec Y = -1.5 Chon iem at tai ( 19,20) ve tai tap trung

Bc 4 : Vao bieu tng lo khoan va chon 3 v tr V tr 1 X = 30 ; Y = 10 V tr 2 X = 10 ; Y = 30 V tr 3 X = 40 ; Y = 10




Tai moi v tr lan lt khai bao a chat va gan a chat nh bang sau : V tr 1 :

a chat nh sau :




V tr 2

Va tai v tr 3




Cao o mc nc 50 Bc 5 : Phat sinh li 2D Mesh Generation




Mat phang Y = -1.5 th




Tnh toan cho phase 1 : Co coc Next phase Phase 1 : Co coc ,nh vay tai Y = 0 th

Tai Y = -1.5 th




Tai Y = -6 th


Phase 2 : Bat au t Phase 1 va gan them tai trong tap trung X = -1000 KN va Y = 0 mat phang Y = -1.5 m




Ket qua nh sau:




Bai 11. 3D FOUNDATION - Ho ao co thanh chong va co tai ben




Bc 1: Khai bao bai toan , vung Xmin = 0 ; Xmax = 50 Zmin = 0 : Zmax = 40





Dung bieu tng Work Plane nhap y = 0.5 ; y = -0.5 ; y = -5 ; y = -7 va y = -19

Bc 3 : Vao tng mat phang Y = 0.5 ve tng va thanh chong Y = -0.5 ve tai trong ben va tng Y = -5 ve tng




Y = -7 ve tng Y = 0.5 Ve tng bang bieu tng va thanh chong bang bieu tng

Cac mat phang Y = -0.5 , Y = -5 va Y = -7 ve tng Mat phang Y = -0.5 ve tai ben bang lc phan bo.

Bc 4 : Vao bieu tng lo khoan va chon v tr v du X = 25 ; Y = 20




OK






Dung Hydrostatic e nhap WPress




Bc 6: Chon mat phang tai Y = 0.5 khai bao vat lieu lam tng,thanh chong va gan vat lieu cho tng, thanh chong.






Mat phang Y = -0.5 th




Mat phang Y = -5 va Y = -7m th

Y = -19 th





Tnh toan cho phase 1 : Co tng va thanh chong Next phase Phase 1 : Co tng va thanh chong nh vay tai Y = 0.5 chon hien th nh sau:




Y = -0.5 th

Y = -5 va Y = -7 th




Y = -19 th





Phase 2 : ao ho en Y = -7 m Tai Y = 0.5




Tai Y = 0.5

Tai Y = -5




Tai Y = -7 th




Tai Y = -19 th

Ket qua nh sau:




Phase 4 : Co tai trong ben q = -100 kN/m2 Tai Y = -0.5 th




Chuyen v tai cao o -5




Momen trong c tai cao o -5

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